Spinodal instabilities of spin polarized asymmetric nuclear matter

Abstract

We analyze the spinodal instabilities of spin polarized asymmetric nuclear matter at zero temperature for several configurations of the neutron and proton spins. The calculations are performed with the Brueckner--Hartree--Fock (BHF) approach using the Argonne V18 nucleon-nucleon potential plus a three-nucleon force of Urbana type. An analytical parametrization of the energy density, which reproduces with good accuracy the BHF results, is employed to determine the spinodal instability region. We find that, independently of the of the orientation of the neutron and proton spins, the spinodal instability region shinks when the system is polarized, being its size smaller smaller when neutron and proton spins are antiparallel than when they are oriented in a parallel way. We find also that the spinodal instability is always dominated by total density fluctuation independently of the degree of polarization of the system, and that restoration of the isospin symmetry in the liquid phase, {\it i.e.,} the so-called isospin distillation or fragmentation effect, becomes less efficient with the polarization of the system.

8 pages, 6 figures, 1 table

References in corpus (10)

• Spinodal decomposition of low-density asymmetric nuclear matter
• Isospin-dependent clusterization of Neutron-Star Matter
• Isospin fractionation : equilibrium versus spinodal decomposition
• Low densities in asymmetric nuclear matter
• Effect of the Wood-Saxon nuclear distribution on the chiral magnetic field in Relativistic Heavy-ion Collisions
• Effect of strong magnetic fields on the crust-core transition and inner crust of neutron stars
• Spinodal instabilities of asymmetric nuclear matter within the Brueckner--Hartree--Fock approach
• Spinodal instabilities and the distillation effect in nuclear matter under strong magnetic fields
• Dynamical instabilities in density-dependent hadronic relativistic models
• Stability of the neutron-proton-electron matter under strong magnetic fields: the covariant Vlasov approach